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# Copyright 1999-2010 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/scons-utils.eclass,v 1.3 2011/02/07 14:55:08 mgorny Exp $
# @ECLASS: scons-utils.eclass
# @MAINTAINER:
# mgorny@gentoo.org
# @BLURB: helper functions to deal with SCons buildsystem
# @DESCRIPTION:
# This eclass provides a set of function to help developers sanely call
# dev-util/scons and pass parameters to it.
# @EXAMPLE:
#
# @CODE
# inherit scons-utils toolchain-funcs
#
# src_compile() {
# tc-export CC CXX
# escons \
# $(use_scons nls ENABLE_NLS) \
# || die
# }
# @CODE
# -- public variables --
# @ECLASS-VARIABLE: SCONS_MIN_VERSION
# @DEFAULT_UNSET
# @DESCRIPTION:
# The minimal version of SCons required for the build to work.
# @ECLASS-VARIABLE: SCONSOPTS
# @DEFAULT_UNSET
# @DESCRIPTION:
# The default set of options to pass to scons. Similar to MAKEOPTS,
# supposed to be set in make.conf. If unset, escons() will use cleaned
# up MAKEOPTS instead.
# @ECLASS-VARIABLE: EXTRA_ESCONS
# @DEFAULT_UNSET
# @DESCRIPTION:
# The additional parameters to pass to SCons whenever escons() is used.
# @ECLASS-VARIABLE: USE_SCONS_TRUE
# @DESCRIPTION:
# The default value for truth in scons-use() (1 by default).
: ${USE_SCONS_TRUE:=1}
# @ECLASS-VARIABLE: USE_SCONS_FALSE
# @DESCRIPTION:
# The default value for false in scons-use() (0 by default).
: ${USE_SCONS_FALSE:=0}
# -- ebuild variables setup --
if [[ -n ${SCONS_MIN_VERSION} ]]; then
DEPEND=">=dev-util/scons-${SCONS_MIN_VERSION}"
else
DEPEND="dev-util/scons"
fi
# -- public functions --
# @FUNCTION: escons
# @USAGE: [scons-arg] ...
# @DESCRIPTION:
# Call scons, passing the supplied arguments, ${MAKEOPTS} and
# ${EXTRA_ESCONS}. Similar to emake.
escons() {
debug-print-function ${FUNCNAME} "${@}"
# if SCONSOPTS are _unset_, use cleaned MAKEOPTS
set -- scons ${SCONSOPTS-$(scons_clean_makeopts)} ${EXTRA_ESCONS} "${@}"
echo "${@}" >&2
"${@}"
}
# @FUNCTION: scons_clean_makeopts
# @USAGE: [makeflags] [...]
# @DESCRIPTION:
# Strip the supplied makeflags (or ${MAKEOPTS} if called without
# an argument) of options not supported by SCons and make sure --jobs
# gets an argument. Output the resulting flag list (suitable
# for an assignment to SCONSOPTS).
scons_clean_makeopts() {
local new_makeopts
debug-print-function ${FUNCNAME} "${@}"
if [[ ${#} -eq 0 ]]; then
debug-print "Using MAKEOPTS: [${MAKEOPTS}]"
set -- ${MAKEOPTS}
else
# unquote if necessary
set -- ${*}
fi
# empty MAKEOPTS give out empty SCONSOPTS
# thus, we do need to worry about the initial setup
if [[ ${*} = ${_SCONS_CACHE_MAKEOPTS} ]]; then
set -- ${_SCONS_CACHE_SCONSOPTS}
debug-print "Cache hit: [${*}]"
echo ${*}
return
fi
export _SCONS_CACHE_MAKEOPTS=${*}
while [[ ${#} -gt 0 ]]; do
case ${1} in
# clean, simple to check -- we like that
--jobs=*|--keep-going)
new_makeopts=${new_makeopts+${new_makeopts} }${1}
;;
# need to take a look at the next arg and guess
--jobs)
if [[ ${#} -gt 1 && ${2} =~ [0-9]+ ]]; then
new_makeopts="${new_makeopts+${new_makeopts} }${1} ${2}"
shift
else
# no value means no limit, let's pass a random int
new_makeopts=${new_makeopts+${new_makeopts} }${1}=5
fi
;;
# strip other long options
--*)
;;
# short option hell
-*)
local str new_optstr
new_optstr=
str=${1#-}
while [[ -n ${str} ]]; do
case ${str} in
k*)
new_optstr=${new_optstr}k
;;
# -j needs to come last
j)
if [[ ${#} -gt 1 && ${2} =~ [0-9]+ ]]; then
new_optstr="${new_optstr}j ${2}"
shift
else
new_optstr="${new_optstr}j 5"
fi
;;
# otherwise, everything after -j is treated as an arg
j*)
new_optstr=${new_optstr}${str}
break
;;
esac
str=${str#?}
done
if [[ -n ${new_optstr} ]]; then
new_makeopts=${new_makeopts+${new_makeopts} }-${new_optstr}
fi
;;
esac
shift
done
set -- ${new_makeopts}
export _SCONS_CACHE_SCONSOPTS=${*}
debug-print "New SCONSOPTS: [${*}]"
echo ${*}
}
# @FUNCTION: use_scons
# @USAGE: <use-flag> [var-name] [var-opt-true] [var-opt-false]
# @DESCRIPTION:
# Output a SCons parameter with value depending on the USE flag state.
# If the USE flag is set, output <var-name>=<var-opt-true>; otherwise
# <var-name>=<var-opt-false>.
#
# If <var-name> is omitted, <use-flag> will be used instead. However,
# if <use-flag> starts with an exclamation mark (!flag), 'no' will be
# prepended to the name (e.g. noflag).
#
# If <var-opt-true> and/or <var-opt-false> are omitted,
# ${USE_SCONS_TRUE} and/or ${USE_SCONS_FALSE} will be used instead.
use_scons() {
local flag=${1}
local varname=${2:-${flag/\!/no}}
local vartrue=${3:-${USE_SCONS_TRUE}}
local varfalse=${4:-${USE_SCONS_FALSE}}
debug-print-function ${FUNCNAME} "${@}"
if [[ ${#} -eq 0 ]]; then
eerror "Usage: scons-use <use-flag> [var-name] [var-opt-true] [var-opt-false]"
die 'scons-use(): not enough arguments'
fi
if use "${flag}"; then
echo "${varname}=${vartrue}"
else
echo "${varname}=${varfalse}"
fi
}
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